Display screen or portion thereof with a graphical user interface



A portion of the disclosure of this patent document contains material to which a claim for copyright is made. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but reserves all othr copyright rights whatsoever.

The single FIGURE is a front view of a display screen or portion thereof with a graphical user interface.

The dashed broken lines depicting the display screen or portions thereof form no part of the claimed design. The remaining broken lines depicting portions of the graphical user interface form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with a graphical user interface, as shown and described. 